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    Adaptive Coded Modulation for IM/DD Free-Space Optical Backhauling: A Probabilistic Shaping Approach

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    Type
    Article
    Authors
    Elzanaty, Ahmed cc
    Alouini, Mohamed-Slim cc
    KAUST Department
    Communication Theory Lab
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Date
    2020-07-10
    Preprint Posting Date
    2020-05-05
    Online Publication Date
    2020-07-10
    Print Publication Date
    2020-10
    Submitted Date
    2020-05-05
    Permanent link to this record
    http://hdl.handle.net/10754/662990
    
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    Abstract
    In this paper, we propose a practical adaptive coding modulation scheme to approach the capacity of free-space optical (FSO) channels with intensity modulation/direct detection based on probabilistic shaping. The encoder efficiently adapts the transmission rate to the signal-to-noise ratio, accounting for the fading induced by the atmospheric turbulence. The transponder can support an arbitrarily large number of transmission modes using a low complexity channel encoder with a small set of supported rates. Hence, it can provide a solution for FSO backhauling in terrestrial and satellite communication systems to achieve higher spectral efficiency. We propose two algorithms to determine the capacity and capacity-achieving distribution of the scheme with unipolar M-ary pulse amplitude modulation (M-PAM) signaling. Then, the signal constellation is probabilistically shaped according to the optimal distribution, and the shaped signal is channel encoded by an efficient binary forward error correction scheme. Extensive numerical results and simulations are provided to evaluate the performance. The proposed scheme yields a rate close to the tightest lower bound on the capacity of FSO channels. For instance, the coded modulator operates within 0:2 dB from the M-PAM capacity, and it outperforms uniform signaling with more than 1:7 dB, at a transmission rate of 3 bits per channel use.
    Citation
    Elzanaty, A., & Alouini, M.-S. (2020). Adaptive Coded Modulation for IM/DD Free-Space Optical Backhauling: A Probabilistic Shaping Approach. IEEE Transactions on Communications, 1–1. doi:10.1109/tcomm.2020.3006575
    Publisher
    Institute of Electrical and Electronics Engineers (IEEE)
    Journal
    IEEE Transactions on Communications
    DOI
    10.1109/TCOMM.2020.3006575
    arXiv
    2005.02129
    Additional Links
    https://ieeexplore.ieee.org/document/9138713/
    https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9138713
    ae974a485f413a2113503eed53cd6c53
    10.1109/TCOMM.2020.3006575
    Scopus Count
    Collections
    Articles; Electrical and Computer Engineering Program; Communication Theory Lab; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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